Calculator Inputs
Calculate.Example Data Table
| Scenario | Input 1 | Input 2 | Input 3 | Input 4 | Input 5 | Input 6 |
|---|---|---|---|---|---|---|
| Wall Area | 50 m2 | Brick 215x65 mm | Joint 10 mm | Depth 20 mm | Waste 10% | Faces 1 |
| Estimated Mortar | ≈ 0.33 m3 | ≈ 330 L | Mix 1:0:5 | Cement ≈ 11 bags | Sand ≈ 11 bags | Density 2000 kg/m3 |
Formula Used
- Courses per meter = 1 / (H + J)
- Bricks per meter = 1 / (L + J)
- Horizontal length = courses * 1 m
- Vertical length = courses * bricks * H
- Total length = horizontal + vertical
- Groove area = J * D
- Volume per m2 = length per m2 * groove area
- Total volume = area * volume per m2 * faces
- With waste = total volume * (1 + waste%)
How to Use This Calculator
- Measure the wall area to be repointed.
- Enter brick face dimensions and the average joint width.
- Enter the repointing depth you will rake out.
- Select one or two faces, then set a realistic waste percent.
- Choose a mix ratio by volume parts for cement, lime, and sand.
- Add bag sizes and unit costs to generate a cost summary.
- Press Calculate, then export CSV or PDF for records.
Article
Scope and measurement strategy
Repointing quantity control begins with a reliable area takeoff and a field survey of joint condition. Record the net wall area after subtracting large openings, then note whether one or both faces will be treated. Capture typical brick face dimensions and an average joint width from multiple locations to reduce bias. Where erosion is uneven, use the most common joint width rather than the maximum.
Depth selection and workmanship effects
Repointing depth should reflect the depth of unsound mortar removed, not the full joint depth. A deeper rake-out increases volume quickly because groove area is proportional to width multiplied by depth. Tooling style and joint profile can also change consumption, so a waste allowance is essential. For congested joints, allow higher waste to cover losses during packing and cleanup.
Mix ratio planning and material control
Mix parts provide a consistent way to scale materials, but the correct binder choice depends on masonry type. Softer units and heritage walls often require more breathable mixes, while dense modern units may tolerate stronger binders. This calculator splits the computed mortar volume into cement, lime, and sand fractions by your selected parts. Bag counts round up to help procurement avoid mid-shift shortages.
Cost and productivity forecasting
Unit prices and labor rates turn the quantity takeoff into a budget tool. Productivity is typically driven by access, joint raking method, height, and joint congestion. Enter a realistic area-per-hour rate from prior jobs, then compare the estimated hours against the planned crew size. This supports shift planning, scaffold timing, and daily output targets.
Example data and interpretation
Example: area 50 m2, one face, brick 215 x 65 mm, joint 10 mm, depth 20 mm, waste 10%, mix 1:0:5, density 2000 kg/m3. The calculator yields about 0.33 m3 of mortar, roughly 330 L, with rounded bags for cement and sand. Use the PDF export to document assumptions and communicate quantities to procurement and QA staff.
FAQs
1) What does “faces to repoint” mean?
It indicates whether you will repoint one exposed side or both sides of the wall. Two faces approximately doubles the mortar volume for the same area and joint geometry.
2) How do I pick a realistic waste percentage?
Use 5–10% for clean, uniform joints and good access. Use 10–20% when raking is deep, joints are irregular, or cleanup losses are higher than normal.
3) Why does joint width matter so much?
Mortar volume is proportional to joint width multiplied by repointing depth. A small increase in width increases groove area and therefore total volume across the entire wall.
4) Does the calculator account for different bond patterns?
It uses a running bond approximation to estimate joint length per area. For unusual patterns, highly perforated masonry, or stonework, treat results as a planning estimate and adjust waste upward.
5) Should I use the same mortar for historic masonry?
Often not. Historic walls may need lower-strength, more permeable mortars to avoid trapping moisture and damaging units. Confirm specifications with conservation guidance and project requirements before final procurement.
6) How accurate are the bag counts?
Bags are calculated from approximate bulk densities and rounded up. Supplier densities, moisture, and site mixing practices can change mass per volume, so confirm with product datasheets and trial batches.
7) Can I use this for labor planning?
Yes. Enter a productivity rate and labor cost per hour to estimate hours and labor cost. Use a rate derived from similar access, height, and joint conditions for best forecasting.